M-Audio Pre USB

Hi. I'm recording using Garage Band. I've already drag and dropped the backing track but when I record the vocal via the Pre USB I get a double recording with a slight delay. Sounds like I'm singing in a tunnel. Your help would be gratefully received

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hmm, it could be something simple such as a faulty cable from mic to pc, it could be a faulty input if you are using a mixer, could be a faulty mic, it could even be a piece of software running in the background that is conflicting with sonar and causing this problem. This should be an easy problem for your "engineer" to sort out. as seeing it makes it 100 times easier to fault find. Thats part of being an engineer!

Make sure the switch is set to "mic/line" and not "guitar"
Your input level will be set by the "input L" or "input R" knob, depending on which side you are using. Start with them all the way down and then sing into the mic, turning them up until you get a signal about halfway up the bar in Cubase. That should give you plenty of headroom for clean vocals.
It may be difficult to get a good sound if you have one of those cheap mics that has a "1/4" jack instead of a 3-pin XLR jack. You might want to go to your local music/pro audio store and invest in a "condenser" microphone, which is good for vocals in the studio.

What software are you using to record on. Some have sound on sound settings which must be changed to overwrite. Also try deleting sample track or creating a new project or file. If you can give more details I might can help you.

Have a very very quiet space in which to record, with good acoustics (this means a room that will give a flat sound, preferably one with carpeted walls and celings, but any small, well-furnitured room should do).

Do not mix with the interface. Simply put the gain as high as possible without clipping and mix later in your recording program (Cubase, in your case). You can always bring the level down, but trying to gain an already recorded track will introduce noise.

If you are recording vocals, use a pop filter. When recording anything, experiment with different mic positions to attain the best possible, clean sound.

Try this experiment: Record a click track on track #1. Record track #2 of the output of a monitor speaker playing track #1.
Now you have two click tracks which will probably not be cooincident (like they should be).
Measure the offset of the two tracks! You now know your latency exactly, and can compensate by adjusting settings or moving the vocal track back manually that many milliseconds!